# What is the difference between WGS 84 and GDA94?

## What is the difference between WGS 84 and GDA94?

“GDA94” stands for “Geocentric Datum of Australia” while “WGS84” stands for “World Geodetic System 1984.” GDA94 is a coordinate system specifically for Australia. WGS84 is developed for the DMA or United States Defense Mapping Agency which is now called the National Imagery and Mapping Agency or simply NIMA.

## What is the difference between MGA94 and MGA2020?

Map Grid of Australia 2020 (MGA2020) is a metric rectangular grid coordinate system. The difference between MGA94 and MGA2020 Easting and Northing coordinates is approximately 1.8 metres and simply reflects the projected differences between the GDA94 and GDA2020 latitudes and longitudes.

Which is the latest datum being used for mapping in Australia?

Geocentric Datum of Australia
The Geocentric Datum of Australia (GDA) is the current datum for all of Australia. It was first implemented in 1994. WGS84 is the World Geodetic System 1984. It provides the current standard for locational measurement worldwide, particularly in conjunction with the Global Positioning System (GPS) satellite network.

### What are MGA coordinates?

MGA is a metric rectangular grid system (i.e. east and north), comparable to the AMG grid in use since the 1980s. It is a Cartesian coordinate system based on the Universal Transverse Mercator projection and the Geocentric Datum of Australia 1994. The unit of measure is the metre.

### What is datum level?

A surface or level which is regarded as a base from which other levels can be counted (i.e. a datum). For example, sea level is often used as a datum level against which the height of land and depth of the sea bed are measured.

Which is the Geocentric Datum of Australia ( GDA94 )?

Geocentric Datum of Australia (GDA94) Geocentric datum used in Australia GDA94 = ITRF92 (Epoch 1994.0) Defined by ITRF92 coordinates of the AFN Coordinates fixed at 1st January 1994 values Now offset from ITRF and WGS84 by almost 1 metre Offset increasing at up to 70mm/yr

#### What is the difference between GDA94 and GDA2020 coordinates?

data from GDA94 to GDA2020. The difference between GDA94 and GDA2020 coordinates is comprised of a conformal transformation component primarily due to plate tectonic motion (Figure 1), and an irregular (non-conformal) distortion component. The conformal component accounts for the primary coordinate movement between GDA94 and

#### Can a 3-dimensional GDA94 data be transformed?

3-dimensional GDA94 data can be transformed using the transformation grids provided, but only the latitude and longitude components will be affected, i.e. the height remains unchanged. If the height component is referenced to the Australian Height Datum (AHD), no height transformation should be undertaken between GDA94 and GDA2020 anyway.

How to transform AGD66 to GDA94 in Excel?

This utility transforms coordinates between AGD66 and GDA94 using the Regional NSW/Victorian seven parameter set. Select your coordinate type, enter your geographic or grid coordinates, then click on the Transform button. A separate window will display the transformation results for all coordinate types.